Tool-holder.



G. E. GREENLEAF & D. H. TEAS. TOOL HOLDER.

APPLICYATION FILED MAY 20,1908.

9%;5552... Patented NOV.3,1l%8.

Witnesses Atmmey UNITED sar turns rarnnr OFFICE}.

GEORGE EDWARD GREENLEAF, OF PLAINFIELD, NEW JERSEY, AND DANIEL HENRYTEAS,

JERSEY CITY, NEW JERSEY.

-1\To. eoacsz.

,Specification of Letters Patent.

NILES BEMENT POND COMPANY, OF

'roonnornna.

Patented Nov. 3, recs.

Application filed May 20, E68. Serial No. 433,325.

To a l whom it may concern:

Be it known that we, GEORGE EDWARD GREENLEAF, a citizen of the UnitedStates, residing at Plainfield, Union county, New Jer vsey, and DANIELHENRY TEAS, a citizen of the United States, residing at New Havep, NewHaven county, Connecticut, have invented certain new and usefulImprovements in Tool- Holders, of which thesfollowing is aspeciiication. v

This invention, relating to tool holders, and devised with particularreference for use on machine tools, will be readily understood from thefollowing description taken in connection with the accompanying drawingin which:

Figure 1 is a plan of a tool holder exemlifying our-present invention:Fig. 2 is a tront elevation of the same: Fig. 3 is a side elevation ofthe same: and Fig. 4 a vertical longitudinal section.

In the drawing :1, indicates the base of the tool holder: 2, thetool-seat thereof: 3, a stud projecting upwardly from the base, near thetool-seat: 4, a lever loosely fitted on the stud and having one endprojecting over the tool-seat: 5, the tool clamped between the tool-seatand one endof the lever: 6, a nut screwed upon the stud over the lever:7, a washer interposed between the nut and the lever and having a convexlower face to facilitate the rocking motion of the lever: 8, a rollermounted in the long end ofthe lever, the axis of this roller beingparallel with the tool-seat and at right angles to the length of thelever: 9, a similar roller journaled in the base below the roller 8: 10,a fluid pressure cylinder mounted on the base below-the level andbetween the rollers and the stud: 11, the piston of the cylinder 12, awedge carried by the outer end of the piston-rod and engaging betweenthe two rollers: 13, 'fluid pipe connection to the inner end of thecylinder: 14, a fluid pipe connection to the outer end of the cylinder:and 15, a spring disposed upon the stud below the lever and serving tourge the lever upward.

- The pipe connections are to be in communication with a suitable sourceof supply of fluid under pressure, say compressed air,

and are to be provided with valvular devices for their control.

The piston and wedge being in their inward osition, and the nut beingroperly move upwardly, the spring lifts the s ort end the nut is to bescrewed down until t e tool is clamped, and in this operation the gripof; the o erators fingers on the nut is suffi- I cient. Fluid underpressure is then to be ad tted to the inner end of the cylinder, theresult being that the wedge is forced outwardly and acts upwardly on thelong end of the lever and causes the tool to be gripped with greatpower. To release the tool, the

ressure from the inner end of the cylinder 1s to be relieved andpressure is to be applied in the outer end of the cylinder, thusretracting the wedge and relieving the heavy pressure on the tool. It isnot essential that the nut be mani ulated at each setting of the tool,the we go having a sufficient range of action to not only clam but toproperly release the tool, the nut eing brought into action inpreliminarily adjusting the lever to suit the tool in hand. The convexwasher not only ermits the rocking of the lever in its norma clampingaction but also permits such rocking of the lever as may be needed tocause the short end of the lever to take a fair bearing throughout itswidth on the top of the tool. It will be observed in the illustrationthat the stud is not located at the mid-width of the lever, being closerto its front edge. This disposition of the stud is not essential but itserves in a plying a superior clamping force to the too near its workinend.

We 0 aim 1. A tool holder comprising, a base, a toolseat thereon, alever fulcrumed on the base and having its shorter end projecting overthe tool-seat so as to clamp a tool thereto, a cylinder secured to thebase, a piston therein, a wedge carried by the piston-rod and engagingbetween the longer end of the lever and a part carried by the base, andfluid connections to the cylinder, combined substantially as set forth.

2. A tool holder comprising, a base, a toolseat thereon, a studprojecting from the base at right angles to the face of the tool-seat, alever loosely mounted on the stud and hav ing its shorter end projectingover the toolseat so as to clamp a tool thereto, means carried by thestud over the lever to revent its rising, a cylinder secured to the ase,a piston therein, a wedge carried by the pistonrod and engaging betweenthe longer'end of 1 rising, a cylinder secured to the base, a pisthelever and a part carried by the base, and ton therein, a wedge carriedby the pistonfluid connections to the cylinder, combined rod andengaging between the-longer end of substantially asset forth. I thelever and a part carried by the base, and- 5 3. A tool holdercomprising, a base, a toolfluid connections. to the cylinder; combined20 seat tlfiereonl, a studlprfjectilrgrom the base substantially as setforth. atri tan estoteaceotetoo-seata lever loosel ymounted on the studand haiv- R F? GREENLEAF' ing its shorter end projecting over the'tool-r BAMBI TEAS 10 seat so as to clamp a tool thereto, the engage-Witnesses as to Greenleaf: ment of the lever with the stud being at aFREDERICK G. LYNN,

oint between the transverse center of the 6120. B. WEAN. ever andtheedge of the lever which is to be Witnesses as'to Teas nearest theoint of the tool, means carried H. M. CLEAVER, 15 by the stu over thelever to prevent its CHAS. K. SEYMOUR.

